[main] Update dependencies from microsoft/testfx

[dotnet-maestro]

This pull request updates the following dependencies

From https://github.com/microsoft/testfx

• Subscription: 6b3b8571-4059-4db5-9b07-cd5e649ae2cc
• Build: 20260919.1 (332898)
• Date Produced: September 20, 2026 4:37:07 AM UTC
• Commit: f0fe5a89980d2b29daeb3c949c08d7f61b9cf939
• Branch: main

• Dependency Updates:
  • From 2.5.0-preview.26467.6 to 2.5.0-preview.26469.1
    • Microsoft.Testing.Platform
  • From 4.5.0-preview.26467.6 to 4.5.0-preview.26469.1
    • MSTest

[microsoft-github-policy-service]

Auto-approve

[Copilot]

Copilot review overview

🟢 Approval recommended

The version and provenance updates are consistent with the described dependency build.

Review effort: Balanced
Findings: None

What changed in this PR

Updates MSTest and Microsoft.Testing.Platform preview dependencies to build 20260918.3.

Changes:

• Bumps MSTest to 4.5.0-preview.26468.3.
• Bumps Microsoft.Testing.Platform to 2.5.0-preview.26468.3.
• Synchronizes dependency metadata to commit 00b4e2a445.

File	Description
eng/​Versions.props	Updates package version properties.
eng/​Version.Details.xml	Updates dependency versions and source SHAs.

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[Copilot]

Copilot review overview

🟢 Approval recommended

The dependency versions and source metadata are consistent with the declared upstream build.

Review effort: Balanced
Findings: None

[github-actions]

Final test-triage resolution — Azure Pipelines build 1604421

Build 1604421 (PR #11387, head fb8d5f94...) completed with one test-product failure:

• Test: Microsoft.Testing.Extensions.UnitTests.HotReloadTests.ShouldRunAsync_WaiterIsBlockedAndCancellationIsRequested_StopsNextRun
• Leg: Linux Release, net9.0 only
• Message: Assert.IsFalse(await shouldRunTask.WaitAsync(TimeSpan.FromSeconds(30), TestContext.CancellationToken)) — expected false, got true (i.e. the wait did not observe the run stopping within 30s).

Matrix correlation: the same test passed on Linux net8.0 (same leg, same job) and on every other OS/TFM combination in this build (macOS net8.0/net9.0, Windows Debug/Release net8.0/net9.0). No retry attempts are recorded for this test in this build.

History: checked 12 prior completed builds over the last 30 days (history collection complete, not truncated) — this test passed in every one of those runs with no prior failures, retries, or flakiness recorded. There is no evidence of recurrence.

Conclusion: this looks like an isolated, timing-sensitive one-off (a 30-second async wait assertion failing only on one Linux/net9.0 leg, with all other legs green and a clean 30-day history) rather than a durable product or test defect. Per the escalation policy, a single occurrence without recurrence across builds does not meet the threshold to create an issue.

Next step if it recurs: if this test fails again on a subsequent build (same or different PR/branch), that would establish a pattern worth a type/flaky-test issue referencing HotReloadTests.ShouldRunAsync_WaiterIsBlockedAndCancellationIsRequested_StopsNextRun. No action taken this time.

🤖 Automated content by GitHub Copilot. Generated by the Pipeline Test Triage workflow. · copilot · auto · 37.3 AIC · ⌖ 6.2 AIC · ⊞ 8.9K

[Copilot]

Copilot review overview

🟢 Approval recommended

The version and commit updates are internally consistent and match the declared dependency build.

Review effort: Balanced
Findings: None